<template>
  <div id="app">
    <div class="todo-header">
      <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
    </div>
  </div>
</template>
<script>
import {nanoid} from 'nanoid';
export default {
  //引入nanoid来随机生成id
  name: "MyHeader",
  data(){
    return{
      title:""
    }
  },
  methods:{
    add(){
      //进行数据的校验
      if(!this.title.trim()){
        alert("输入不能为空");
        return 
      }
      //创建数据对象
      const todoObj = {
        id:nanoid(),
        name:this.title,
        done:false
      }
      //往app.vue中传递数据
      // this.receive(todoObj);
      this.$emit('receive',todoObj)
      this.title ="";
    }
  }
};
</script>
<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
